Stop-arm for hod-elivators



c. w. AN ERSQN. STOP ARM FOR HOD ELEVATORS.

APPLIGA'TION FILED APR, 11. 1917.

1 32 l ,779 Patented Nov. 11, 1919.

vwemtoz UNITED sTArns PATENT OFFICE.- f

CHARLES W. ANDERSON, OF BROOKLYN, NEW YORK.

STOP'ABM FOR HOD-ELEVATORS.

' To all whom it may concern Stop-Arms for Hod-Elevators, of which thefollowing is a specification.

This invention relates to an improvement in stop arms for hod elevatorsand the like.

An object of the invention is to provide a stop arm which while alwaysready to perform its function of stopping the movement of the elevatordevice whenever an obstruction upon the elevator device reaches apredetermined level is of such construction that that portion thereofwhich is engaged by the obstruction may be readily manually moved so asto permit the obstruction to pass when desired.

A more detailed object is to provide a stop arm pivoted to swing in aplane parallel with the plane of movement of the elevat ing device andincluding an extension mem ber pivoted to swing in a plane transverse tothe plane of movement of the elevating device, so that the extensionmember, which projects into position to be engaged by the obstruction onthe elevating device, will not be moved about its pivotal connectionwith the main part of the arm when engaged by the obstruction but whenit is so engaged will cause the main arm to swing in a plane parallel tothe plane of movement of the elevating device and thus operate asuitable automatic stopping mechanism, and so that the extension membermay thereafter be swung about its pivotal connection to dispose it outof the path of the obstruction on the elevating device thereby allowingthe main arm to return to its normal position and the obstruction topass.

Other objects and aims of the invention, more or less specific thanthose referred to above, will be in part obvious and in part pointed outin the course of the following description of the elements,combinations, arrangements of parts and applications of principles,constituting the invention; and the scope of protection contemplatedwill be indicated in the appended claims.

In the accompanying drawings which are to be taken as a part of thisspecification, and in which I have shown merely a preferred form ofembodiment of the invention: i 'ure 1 is a diagrammatic side eleva-;

F tional view showing the general arrange- Specification of LettersPatent.

Application filed April 11, 1917. Serial N0. 161,346.

ment and operation of a hod elevator fitted with a stop arm constructedin accordance with this invention.

Fig. 2 is a top plan view of a stop arm constructed in accordance withthis invention and showing the same in operative position in connectionwith the adjacent elements of the, hod elevator, and

Fig. 3 is a side elevational view of the stop arm shown in Fig. 2.

Referring to the drawings for describing in detail the structure whichis illustrated therein, the reference character L indicates the elevatorchain. This passes over wheels 1 at its upper and lower ends in a wellknown manner, said wheels being mounted upon shafts 2. The upper shaft 2carries a gear 3 which is mounted to be driven from a drive pinion 1through a train 5 and 6. Rotation of the pinion 4 will cause the forwardlead 7 of the chain L to move upwardly so that any obstruction, as 8,upon the lead 7 will be caused to move upwardly, When the obstruction 8reaches a given position it is desirable that the movement of the chainshould automatically cease in order to give the operator 9. chance toremove the obstruction, as for instance when it is a hod or the like, orto remove some article carried by the ObStIllCtlO11,2tS for instancewhen the obstruction is a platform fixed to the chain to support abucket or other article (such a platform for instance is illustrated inmy copending application, Serial No. 161,345 filed on even dateherewith).

Any suitable means may be employed for automatically stopping themovement of the chain. In the instanceillustrated the chain is shown tobe driven by a motor G which is connected by a belt 9- with a pulley 10which is fixed to the shaft 11 upon which the pinion 4 is also fixed. Anidler 12 is carried by a swinging arm 13 mounted on shaft 14 and a pullrod 15 is connected to the free end. of the arm 13 for pulling idler 12into engagement with the belt 9, said idler and associated parts thereofserving as a tightening means for the belt. The belt normally is looseupon the motor pulley and upon the pulley 10 so that unless the idler 12is in tightening position no motion is transmitted from the motor to thepulley 10. The relation of the shaft 14: to the pulley is such that thearm 13 and the idler 12 normally hang away from the belt.

Adjacent the shaft 14 the arm 13 is formed with ratchet teeth 16, and apawl 17 is arranged to engage these teeth to hold the idler 12 intightening position when drawn into said position by the pull rod 15.

The stop arm, as H, of this invention is pivoted to the frame work 18 ofthe elevator 161,343, filed on even date herewith.

The stop arm H is made up of a main port1on'2O and an extension portion21.

a The main portion is formed with an enlarged body part 22 for carryingthe pivot 23 which is arranged to permit swinging movement of the arm ina vertical plane. Lateral projections 24 and 25 are formed upon the bodypart, the former being adapted to engage a ledge 26 of the frame work 18below the pivot to support the arm in normal position, and the latterbeing adapted to engage the same ledge above the pivot to limit upwardmovement of the arm.

These two projections, like the body part 22, rest flat upon the surface'27 of the frame work 18 and serve efliciently with the pivot 23 toretain the main portion of the arm aga nst any lateral twisting inoperation.

The rod or cable 19 is pivotally connected to the main portion at apoint spaced from the p1vot 23, as indicated by the reference numerals28.

The extension portion 21 of the" arm is pivotally mounted atthe outerend of the main portlon 20, as at the pivot pin 29, arranged to permitswinging movement of the 7 extension in a plane at right angles to the5.5 -by said spring. Ahandle 32 is formed plane of movement of the mainportion, that is in a horizontal plane. A suitable spring 30 engagesbetween the main portion and the extension to constantly urge'theextension into operative position, and a suitable stop, as the foot rulestop 31 is provlded to limit movement of the extension upon theextension by means of which it may be readily manually operated. Thefree end of the extension projects into the path of the obstruction '8which is carried by and movable with the chain 7 as above described.

As the obstruction 8 moves upwardly and. engages the extension saidengagement causes the main portion of the arm S g upwardly about thepivot 23 and to thereby lift the pawl 17 and stop the movement of thechain as above described. In producing this operation the obstructionmoves substantially to the position as indicated at 33 in Fig. 1, thatis to a position above the plane in which the extension 21 normallystands. Whenever the operator desires now he presses back the handle 32so as to release. the extension from the obstruction 8 thus carrying theextension into the position substantially as indicated at 34 in Fig. 1.As soon as the handle is released the spring 30 will cause the extensionto swing backwardly. During its backward movement however the force ofgravity is exerted to move the extension downwardly at the same time, assuggested by the arrow 35 in Fig. 1, into its original normal positionleaving the obstruction above and clear of the extension so that whenthe belt tightener is again moved into tightening position by apull'upon the pull rod 15 the chain may move without hindrance until afurther obstruction engages the extension.

The handle 32 is preferably in the form of a weight so as to improve theefficiency of the device.

In order to obtain a more eificient operation of the device theobstruction 8 is preferably formed with a concave up )er surface 36 forengaging the stop arm. ikelihood of premature release of the stop arm isthus avoided. The obstruction is also preferably shaped to form anincline at this under surface 38 said surface continuing forwardly andupwardly and providing a sharp edge 39 where it merges into the uppersurface 36. Ample bulk and strength may thus be given to the obstructionwithout likelihood of interfering with the return movement of the stoparm projection.

As many changes could be made in this construction without departingfrom the scope of the following claims, it is intended that all mattercontained in the above description, or shown in the accompanyingdrawings, shall be interpreted as illustrative only and not in thelimiting sense.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A stop arm for hod elevators, comprising a main portion pivoted toswing in a vertical plane, an extension portion pivoted to the mainportion to swing in a horizontal plane, means to resiliently retain theextension portion in a normal position projecting laterally from themain portion, a handle by'means of which to swing the extension portionout of normal position, and said handle being weighted so as to urge themain and extension portions to swing normally downwardly.

2. A stop arm for hod elevators, comprising an arm pivotally mountedupon a substantially horizontal axis and being adapted to swingdownwardly about said axis, means to limit the downward swinging of thearm, an extension member pivotally connected to said arm at a pointspaced from the pivot of said arm, said extension member being adaptedto be engaged by an upwardly moving part of the elevator to be moved forswinging said arm upwardly to control the elevator drive mechanism, andthe pivot connecting the extension with said arm being on an axistransverse to the pivotal axis of said arm whereby to prevent swingingoi the extension member about its pivot when struck by the moving partof the elevator, while yet enabling manual swinging of the extensionmember about its pivot at all times.

3. A stop arm for hod elevators, comprising an arm pivotally mountedupon a substantially horizontal axis and being adapted to swingdownwardly about said axis, means to limit the downward swinging of thearm,

an extension member pivotally connected to said arm at a point spacedfrom the pivot of said arm, said extension member projecting laterallyfrom said arm and having its free endadapted to be engaged by anupwardly moving part of the elevator to be moved for swinging said armupwardly to control the elevator drive mechanism, and the pivotconnecting the extension member with said arm being on an axistransverse to the pivotal axis of said arm whereby to prevent swingingof the extension member about its pivot when struck by the moving partof the elevator, while yet enabling manual swinging of the extensionmember about its pivot at all times, and said extension memberconstituting a weight normally retaining the arm in its lower position.

In testimony whereof I afiix my signature in the presence of twoWitnesses. v

CHARLES W. ANDERSON. Witnesses:

L. Gnssronn HANDY, GUSTAV GENZLINGER;

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patent:

Washington, D. 0.

